Invasive Aedes aegypti in San Mateo County

Invasive Aedes mosquitoes are not native to San Mateo County, California, or even North America. They do not belong in our ecosystems, and they can make people very uncomfortable because they bite during the day and even bite indoors. More importantly, they are a risk to human health because they can carry diseases that make people very sick, like Zika, chikungunya, dengue, and yellow fever.

Species of invasive Aedes mosquitoes are found in some areas of Arizona and California. One species, Aedes aegypti, has been found in San Mateo County before. This interactive map by the California Department of Public Health shows where they are currently found in our state.

The District has been working hard to get rid of invasive Aedes mosquitoes in our county, and has been very successful so far. The most recent time any invasive Aedes aegypti mosquitoes were found in San Mateo County was in May of 2015.

The District continues to conduct intensive surveillance throughout the county, but you can help out by reporting suspected invasive Aedes mosquito sightings. The sooner we know that these invasive mosquitoes have arrived in our county, the better chance we have of stopping them.

Join California in the Fight Against Zika - Don’t Bring Zika Home

Top 5 Things You Should Know About Zika

Zika virus is transmitted through the bite of an infected mosquito and through unprotected sex with someone who is infected. it can also spread from an infected pregnant woman to her developing baby during pregnancy or around the time of birth.

You are at risk if you or your sexual partner travel to areas with Zika, including Mexico.

A pregnant woman’s developing baby is at greatest risk of being harmed by the Zika vi